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-rw-r--r--lib/asan/asan_rtl.cpp626
1 files changed, 626 insertions, 0 deletions
diff --git a/lib/asan/asan_rtl.cpp b/lib/asan/asan_rtl.cpp
new file mode 100644
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+++ b/lib/asan/asan_rtl.cpp
@@ -0,0 +1,626 @@
+//===-- asan_rtl.cpp ------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of AddressSanitizer, an address sanity checker.
+//
+// Main file of the ASan run-time library.
+//===----------------------------------------------------------------------===//
+
+#include "asan_activation.h"
+#include "asan_allocator.h"
+#include "asan_interceptors.h"
+#include "asan_interface_internal.h"
+#include "asan_internal.h"
+#include "asan_mapping.h"
+#include "asan_poisoning.h"
+#include "asan_report.h"
+#include "asan_stack.h"
+#include "asan_stats.h"
+#include "asan_suppressions.h"
+#include "asan_thread.h"
+#include "sanitizer_common/sanitizer_atomic.h"
+#include "sanitizer_common/sanitizer_flags.h"
+#include "sanitizer_common/sanitizer_libc.h"
+#include "sanitizer_common/sanitizer_symbolizer.h"
+#include "lsan/lsan_common.h"
+#include "ubsan/ubsan_init.h"
+#include "ubsan/ubsan_platform.h"
+
+uptr __asan_shadow_memory_dynamic_address; // Global interface symbol.
+int __asan_option_detect_stack_use_after_return; // Global interface symbol.
+uptr *__asan_test_only_reported_buggy_pointer; // Used only for testing asan.
+
+namespace __asan {
+
+uptr AsanMappingProfile[kAsanMappingProfileSize];
+
+static void AsanDie() {
+ static atomic_uint32_t num_calls;
+ if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) {
+ // Don't die twice - run a busy loop.
+ while (1) { }
+ }
+ if (common_flags()->print_module_map >= 1) PrintModuleMap();
+ if (flags()->sleep_before_dying) {
+ Report("Sleeping for %d second(s)\n", flags()->sleep_before_dying);
+ SleepForSeconds(flags()->sleep_before_dying);
+ }
+ if (flags()->unmap_shadow_on_exit) {
+ if (kMidMemBeg) {
+ UnmapOrDie((void*)kLowShadowBeg, kMidMemBeg - kLowShadowBeg);
+ UnmapOrDie((void*)kMidMemEnd, kHighShadowEnd - kMidMemEnd);
+ } else {
+ if (kHighShadowEnd)
+ UnmapOrDie((void*)kLowShadowBeg, kHighShadowEnd - kLowShadowBeg);
+ }
+ }
+}
+
+static void AsanCheckFailed(const char *file, int line, const char *cond,
+ u64 v1, u64 v2) {
+ Report("AddressSanitizer CHECK failed: %s:%d \"%s\" (0x%zx, 0x%zx)\n", file,
+ line, cond, (uptr)v1, (uptr)v2);
+
+ // Print a stack trace the first time we come here. Otherwise, we probably
+ // failed a CHECK during symbolization.
+ static atomic_uint32_t num_calls;
+ if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) == 0) {
+ PRINT_CURRENT_STACK_CHECK();
+ }
+
+ Die();
+}
+
+// -------------------------- Globals --------------------- {{{1
+int asan_inited;
+bool asan_init_is_running;
+
+#if !ASAN_FIXED_MAPPING
+uptr kHighMemEnd, kMidMemBeg, kMidMemEnd;
+#endif
+
+// -------------------------- Misc ---------------- {{{1
+void ShowStatsAndAbort() {
+ __asan_print_accumulated_stats();
+ Die();
+}
+
+// --------------- LowLevelAllocateCallbac ---------- {{{1
+static void OnLowLevelAllocate(uptr ptr, uptr size) {
+ PoisonShadow(ptr, size, kAsanInternalHeapMagic);
+}
+
+// -------------------------- Run-time entry ------------------- {{{1
+// exported functions
+#define ASAN_REPORT_ERROR(type, is_write, size) \
+extern "C" NOINLINE INTERFACE_ATTRIBUTE \
+void __asan_report_ ## type ## size(uptr addr) { \
+ GET_CALLER_PC_BP_SP; \
+ ReportGenericError(pc, bp, sp, addr, is_write, size, 0, true); \
+} \
+extern "C" NOINLINE INTERFACE_ATTRIBUTE \
+void __asan_report_exp_ ## type ## size(uptr addr, u32 exp) { \
+ GET_CALLER_PC_BP_SP; \
+ ReportGenericError(pc, bp, sp, addr, is_write, size, exp, true); \
+} \
+extern "C" NOINLINE INTERFACE_ATTRIBUTE \
+void __asan_report_ ## type ## size ## _noabort(uptr addr) { \
+ GET_CALLER_PC_BP_SP; \
+ ReportGenericError(pc, bp, sp, addr, is_write, size, 0, false); \
+} \
+
+ASAN_REPORT_ERROR(load, false, 1)
+ASAN_REPORT_ERROR(load, false, 2)
+ASAN_REPORT_ERROR(load, false, 4)
+ASAN_REPORT_ERROR(load, false, 8)
+ASAN_REPORT_ERROR(load, false, 16)
+ASAN_REPORT_ERROR(store, true, 1)
+ASAN_REPORT_ERROR(store, true, 2)
+ASAN_REPORT_ERROR(store, true, 4)
+ASAN_REPORT_ERROR(store, true, 8)
+ASAN_REPORT_ERROR(store, true, 16)
+
+#define ASAN_REPORT_ERROR_N(type, is_write) \
+extern "C" NOINLINE INTERFACE_ATTRIBUTE \
+void __asan_report_ ## type ## _n(uptr addr, uptr size) { \
+ GET_CALLER_PC_BP_SP; \
+ ReportGenericError(pc, bp, sp, addr, is_write, size, 0, true); \
+} \
+extern "C" NOINLINE INTERFACE_ATTRIBUTE \
+void __asan_report_exp_ ## type ## _n(uptr addr, uptr size, u32 exp) { \
+ GET_CALLER_PC_BP_SP; \
+ ReportGenericError(pc, bp, sp, addr, is_write, size, exp, true); \
+} \
+extern "C" NOINLINE INTERFACE_ATTRIBUTE \
+void __asan_report_ ## type ## _n_noabort(uptr addr, uptr size) { \
+ GET_CALLER_PC_BP_SP; \
+ ReportGenericError(pc, bp, sp, addr, is_write, size, 0, false); \
+} \
+
+ASAN_REPORT_ERROR_N(load, false)
+ASAN_REPORT_ERROR_N(store, true)
+
+#define ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, exp_arg, fatal) \
+ if (SANITIZER_MYRIAD2 && !AddrIsInMem(addr) && !AddrIsInShadow(addr)) \
+ return; \
+ uptr sp = MEM_TO_SHADOW(addr); \
+ uptr s = size <= SHADOW_GRANULARITY ? *reinterpret_cast<u8 *>(sp) \
+ : *reinterpret_cast<u16 *>(sp); \
+ if (UNLIKELY(s)) { \
+ if (UNLIKELY(size >= SHADOW_GRANULARITY || \
+ ((s8)((addr & (SHADOW_GRANULARITY - 1)) + size - 1)) >= \
+ (s8)s)) { \
+ if (__asan_test_only_reported_buggy_pointer) { \
+ *__asan_test_only_reported_buggy_pointer = addr; \
+ } else { \
+ GET_CALLER_PC_BP_SP; \
+ ReportGenericError(pc, bp, sp, addr, is_write, size, exp_arg, \
+ fatal); \
+ } \
+ } \
+ }
+
+#define ASAN_MEMORY_ACCESS_CALLBACK(type, is_write, size) \
+ extern "C" NOINLINE INTERFACE_ATTRIBUTE \
+ void __asan_##type##size(uptr addr) { \
+ ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, 0, true) \
+ } \
+ extern "C" NOINLINE INTERFACE_ATTRIBUTE \
+ void __asan_exp_##type##size(uptr addr, u32 exp) { \
+ ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, exp, true) \
+ } \
+ extern "C" NOINLINE INTERFACE_ATTRIBUTE \
+ void __asan_##type##size ## _noabort(uptr addr) { \
+ ASAN_MEMORY_ACCESS_CALLBACK_BODY(type, is_write, size, 0, false) \
+ } \
+
+ASAN_MEMORY_ACCESS_CALLBACK(load, false, 1)
+ASAN_MEMORY_ACCESS_CALLBACK(load, false, 2)
+ASAN_MEMORY_ACCESS_CALLBACK(load, false, 4)
+ASAN_MEMORY_ACCESS_CALLBACK(load, false, 8)
+ASAN_MEMORY_ACCESS_CALLBACK(load, false, 16)
+ASAN_MEMORY_ACCESS_CALLBACK(store, true, 1)
+ASAN_MEMORY_ACCESS_CALLBACK(store, true, 2)
+ASAN_MEMORY_ACCESS_CALLBACK(store, true, 4)
+ASAN_MEMORY_ACCESS_CALLBACK(store, true, 8)
+ASAN_MEMORY_ACCESS_CALLBACK(store, true, 16)
+
+extern "C"
+NOINLINE INTERFACE_ATTRIBUTE
+void __asan_loadN(uptr addr, uptr size) {
+ if (__asan_region_is_poisoned(addr, size)) {
+ GET_CALLER_PC_BP_SP;
+ ReportGenericError(pc, bp, sp, addr, false, size, 0, true);
+ }
+}
+
+extern "C"
+NOINLINE INTERFACE_ATTRIBUTE
+void __asan_exp_loadN(uptr addr, uptr size, u32 exp) {
+ if (__asan_region_is_poisoned(addr, size)) {
+ GET_CALLER_PC_BP_SP;
+ ReportGenericError(pc, bp, sp, addr, false, size, exp, true);
+ }
+}
+
+extern "C"
+NOINLINE INTERFACE_ATTRIBUTE
+void __asan_loadN_noabort(uptr addr, uptr size) {
+ if (__asan_region_is_poisoned(addr, size)) {
+ GET_CALLER_PC_BP_SP;
+ ReportGenericError(pc, bp, sp, addr, false, size, 0, false);
+ }
+}
+
+extern "C"
+NOINLINE INTERFACE_ATTRIBUTE
+void __asan_storeN(uptr addr, uptr size) {
+ if (__asan_region_is_poisoned(addr, size)) {
+ GET_CALLER_PC_BP_SP;
+ ReportGenericError(pc, bp, sp, addr, true, size, 0, true);
+ }
+}
+
+extern "C"
+NOINLINE INTERFACE_ATTRIBUTE
+void __asan_exp_storeN(uptr addr, uptr size, u32 exp) {
+ if (__asan_region_is_poisoned(addr, size)) {
+ GET_CALLER_PC_BP_SP;
+ ReportGenericError(pc, bp, sp, addr, true, size, exp, true);
+ }
+}
+
+extern "C"
+NOINLINE INTERFACE_ATTRIBUTE
+void __asan_storeN_noabort(uptr addr, uptr size) {
+ if (__asan_region_is_poisoned(addr, size)) {
+ GET_CALLER_PC_BP_SP;
+ ReportGenericError(pc, bp, sp, addr, true, size, 0, false);
+ }
+}
+
+// Force the linker to keep the symbols for various ASan interface functions.
+// We want to keep those in the executable in order to let the instrumented
+// dynamic libraries access the symbol even if it is not used by the executable
+// itself. This should help if the build system is removing dead code at link
+// time.
+static NOINLINE void force_interface_symbols() {
+ volatile int fake_condition = 0; // prevent dead condition elimination.
+ // __asan_report_* functions are noreturn, so we need a switch to prevent
+ // the compiler from removing any of them.
+ // clang-format off
+ switch (fake_condition) {
+ case 1: __asan_report_load1(0); break;
+ case 2: __asan_report_load2(0); break;
+ case 3: __asan_report_load4(0); break;
+ case 4: __asan_report_load8(0); break;
+ case 5: __asan_report_load16(0); break;
+ case 6: __asan_report_load_n(0, 0); break;
+ case 7: __asan_report_store1(0); break;
+ case 8: __asan_report_store2(0); break;
+ case 9: __asan_report_store4(0); break;
+ case 10: __asan_report_store8(0); break;
+ case 11: __asan_report_store16(0); break;
+ case 12: __asan_report_store_n(0, 0); break;
+ case 13: __asan_report_exp_load1(0, 0); break;
+ case 14: __asan_report_exp_load2(0, 0); break;
+ case 15: __asan_report_exp_load4(0, 0); break;
+ case 16: __asan_report_exp_load8(0, 0); break;
+ case 17: __asan_report_exp_load16(0, 0); break;
+ case 18: __asan_report_exp_load_n(0, 0, 0); break;
+ case 19: __asan_report_exp_store1(0, 0); break;
+ case 20: __asan_report_exp_store2(0, 0); break;
+ case 21: __asan_report_exp_store4(0, 0); break;
+ case 22: __asan_report_exp_store8(0, 0); break;
+ case 23: __asan_report_exp_store16(0, 0); break;
+ case 24: __asan_report_exp_store_n(0, 0, 0); break;
+ case 25: __asan_register_globals(nullptr, 0); break;
+ case 26: __asan_unregister_globals(nullptr, 0); break;
+ case 27: __asan_set_death_callback(nullptr); break;
+ case 28: __asan_set_error_report_callback(nullptr); break;
+ case 29: __asan_handle_no_return(); break;
+ case 30: __asan_address_is_poisoned(nullptr); break;
+ case 31: __asan_poison_memory_region(nullptr, 0); break;
+ case 32: __asan_unpoison_memory_region(nullptr, 0); break;
+ case 34: __asan_before_dynamic_init(nullptr); break;
+ case 35: __asan_after_dynamic_init(); break;
+ case 36: __asan_poison_stack_memory(0, 0); break;
+ case 37: __asan_unpoison_stack_memory(0, 0); break;
+ case 38: __asan_region_is_poisoned(0, 0); break;
+ case 39: __asan_describe_address(0); break;
+ case 40: __asan_set_shadow_00(0, 0); break;
+ case 41: __asan_set_shadow_f1(0, 0); break;
+ case 42: __asan_set_shadow_f2(0, 0); break;
+ case 43: __asan_set_shadow_f3(0, 0); break;
+ case 44: __asan_set_shadow_f5(0, 0); break;
+ case 45: __asan_set_shadow_f8(0, 0); break;
+ }
+ // clang-format on
+}
+
+static void asan_atexit() {
+ Printf("AddressSanitizer exit stats:\n");
+ __asan_print_accumulated_stats();
+ // Print AsanMappingProfile.
+ for (uptr i = 0; i < kAsanMappingProfileSize; i++) {
+ if (AsanMappingProfile[i] == 0) continue;
+ Printf("asan_mapping.h:%zd -- %zd\n", i, AsanMappingProfile[i]);
+ }
+}
+
+static void InitializeHighMemEnd() {
+#if !SANITIZER_MYRIAD2
+#if !ASAN_FIXED_MAPPING
+ kHighMemEnd = GetMaxUserVirtualAddress();
+ // Increase kHighMemEnd to make sure it's properly
+ // aligned together with kHighMemBeg:
+ kHighMemEnd |= SHADOW_GRANULARITY * GetMmapGranularity() - 1;
+#endif // !ASAN_FIXED_MAPPING
+ CHECK_EQ((kHighMemBeg % GetMmapGranularity()), 0);
+#endif // !SANITIZER_MYRIAD2
+}
+
+void PrintAddressSpaceLayout() {
+ if (kHighMemBeg) {
+ Printf("|| `[%p, %p]` || HighMem ||\n",
+ (void*)kHighMemBeg, (void*)kHighMemEnd);
+ Printf("|| `[%p, %p]` || HighShadow ||\n",
+ (void*)kHighShadowBeg, (void*)kHighShadowEnd);
+ }
+ if (kMidMemBeg) {
+ Printf("|| `[%p, %p]` || ShadowGap3 ||\n",
+ (void*)kShadowGap3Beg, (void*)kShadowGap3End);
+ Printf("|| `[%p, %p]` || MidMem ||\n",
+ (void*)kMidMemBeg, (void*)kMidMemEnd);
+ Printf("|| `[%p, %p]` || ShadowGap2 ||\n",
+ (void*)kShadowGap2Beg, (void*)kShadowGap2End);
+ Printf("|| `[%p, %p]` || MidShadow ||\n",
+ (void*)kMidShadowBeg, (void*)kMidShadowEnd);
+ }
+ Printf("|| `[%p, %p]` || ShadowGap ||\n",
+ (void*)kShadowGapBeg, (void*)kShadowGapEnd);
+ if (kLowShadowBeg) {
+ Printf("|| `[%p, %p]` || LowShadow ||\n",
+ (void*)kLowShadowBeg, (void*)kLowShadowEnd);
+ Printf("|| `[%p, %p]` || LowMem ||\n",
+ (void*)kLowMemBeg, (void*)kLowMemEnd);
+ }
+ Printf("MemToShadow(shadow): %p %p",
+ (void*)MEM_TO_SHADOW(kLowShadowBeg),
+ (void*)MEM_TO_SHADOW(kLowShadowEnd));
+ if (kHighMemBeg) {
+ Printf(" %p %p",
+ (void*)MEM_TO_SHADOW(kHighShadowBeg),
+ (void*)MEM_TO_SHADOW(kHighShadowEnd));
+ }
+ if (kMidMemBeg) {
+ Printf(" %p %p",
+ (void*)MEM_TO_SHADOW(kMidShadowBeg),
+ (void*)MEM_TO_SHADOW(kMidShadowEnd));
+ }
+ Printf("\n");
+ Printf("redzone=%zu\n", (uptr)flags()->redzone);
+ Printf("max_redzone=%zu\n", (uptr)flags()->max_redzone);
+ Printf("quarantine_size_mb=%zuM\n", (uptr)flags()->quarantine_size_mb);
+ Printf("thread_local_quarantine_size_kb=%zuK\n",
+ (uptr)flags()->thread_local_quarantine_size_kb);
+ Printf("malloc_context_size=%zu\n",
+ (uptr)common_flags()->malloc_context_size);
+
+ Printf("SHADOW_SCALE: %d\n", (int)SHADOW_SCALE);
+ Printf("SHADOW_GRANULARITY: %d\n", (int)SHADOW_GRANULARITY);
+ Printf("SHADOW_OFFSET: 0x%zx\n", (uptr)SHADOW_OFFSET);
+ CHECK(SHADOW_SCALE >= 3 && SHADOW_SCALE <= 7);
+ if (kMidMemBeg)
+ CHECK(kMidShadowBeg > kLowShadowEnd &&
+ kMidMemBeg > kMidShadowEnd &&
+ kHighShadowBeg > kMidMemEnd);
+}
+
+#if defined(__thumb__) && defined(__linux__)
+#define START_BACKGROUND_THREAD_IN_ASAN_INTERNAL
+#endif
+
+#ifndef START_BACKGROUND_THREAD_IN_ASAN_INTERNAL
+static bool UNUSED __local_asan_dyninit = [] {
+ MaybeStartBackgroudThread();
+ SetSoftRssLimitExceededCallback(AsanSoftRssLimitExceededCallback);
+
+ return false;
+}();
+#endif
+
+static void AsanInitInternal() {
+ if (LIKELY(asan_inited)) return;
+ SanitizerToolName = "AddressSanitizer";
+ CHECK(!asan_init_is_running && "ASan init calls itself!");
+ asan_init_is_running = true;
+
+ CacheBinaryName();
+
+ // Initialize flags. This must be done early, because most of the
+ // initialization steps look at flags().
+ InitializeFlags();
+
+ // Stop performing init at this point if we are being loaded via
+ // dlopen() and the platform supports it.
+ if (SANITIZER_SUPPORTS_INIT_FOR_DLOPEN && UNLIKELY(HandleDlopenInit())) {
+ asan_init_is_running = false;
+ VReport(1, "AddressSanitizer init is being performed for dlopen().\n");
+ return;
+ }
+
+ AsanCheckIncompatibleRT();
+ AsanCheckDynamicRTPrereqs();
+ AvoidCVE_2016_2143();
+
+ SetCanPoisonMemory(flags()->poison_heap);
+ SetMallocContextSize(common_flags()->malloc_context_size);
+
+ InitializePlatformExceptionHandlers();
+
+ InitializeHighMemEnd();
+
+ // Make sure we are not statically linked.
+ AsanDoesNotSupportStaticLinkage();
+
+ // Install tool-specific callbacks in sanitizer_common.
+ AddDieCallback(AsanDie);
+ SetCheckFailedCallback(AsanCheckFailed);
+ SetPrintfAndReportCallback(AppendToErrorMessageBuffer);
+
+ __sanitizer_set_report_path(common_flags()->log_path);
+
+ __asan_option_detect_stack_use_after_return =
+ flags()->detect_stack_use_after_return;
+
+ __sanitizer::InitializePlatformEarly();
+
+ // Re-exec ourselves if we need to set additional env or command line args.
+ MaybeReexec();
+
+ // Setup internal allocator callback.
+ SetLowLevelAllocateMinAlignment(SHADOW_GRANULARITY);
+ SetLowLevelAllocateCallback(OnLowLevelAllocate);
+
+ InitializeAsanInterceptors();
+ CheckASLR();
+
+ // Enable system log ("adb logcat") on Android.
+ // Doing this before interceptors are initialized crashes in:
+ // AsanInitInternal -> android_log_write -> __interceptor_strcmp
+ AndroidLogInit();
+
+ ReplaceSystemMalloc();
+
+ DisableCoreDumperIfNecessary();
+
+ InitializeShadowMemory();
+
+ AsanTSDInit(PlatformTSDDtor);
+ InstallDeadlySignalHandlers(AsanOnDeadlySignal);
+
+ AllocatorOptions allocator_options;
+ allocator_options.SetFrom(flags(), common_flags());
+ InitializeAllocator(allocator_options);
+
+#ifdef START_BACKGROUND_THREAD_IN_ASAN_INTERNAL
+ MaybeStartBackgroudThread();
+ SetSoftRssLimitExceededCallback(AsanSoftRssLimitExceededCallback);
+#endif
+
+ // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited
+ // should be set to 1 prior to initializing the threads.
+ asan_inited = 1;
+ asan_init_is_running = false;
+
+ if (flags()->atexit)
+ Atexit(asan_atexit);
+
+ InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
+
+ // Now that ASan runtime is (mostly) initialized, deactivate it if
+ // necessary, so that it can be re-activated when requested.
+ if (flags()->start_deactivated)
+ AsanDeactivate();
+
+ // interceptors
+ InitTlsSize();
+
+ // Create main thread.
+ AsanThread *main_thread = CreateMainThread();
+ CHECK_EQ(0, main_thread->tid());
+ force_interface_symbols(); // no-op.
+ SanitizerInitializeUnwinder();
+
+ if (CAN_SANITIZE_LEAKS) {
+ __lsan::InitCommonLsan();
+ if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit) {
+ if (flags()->halt_on_error)
+ Atexit(__lsan::DoLeakCheck);
+ else
+ Atexit(__lsan::DoRecoverableLeakCheckVoid);
+ }
+ }
+
+#if CAN_SANITIZE_UB
+ __ubsan::InitAsPlugin();
+#endif
+
+ InitializeSuppressions();
+
+ if (CAN_SANITIZE_LEAKS) {
+ // LateInitialize() calls dlsym, which can allocate an error string buffer
+ // in the TLS. Let's ignore the allocation to avoid reporting a leak.
+ __lsan::ScopedInterceptorDisabler disabler;
+ Symbolizer::LateInitialize();
+ } else {
+ Symbolizer::LateInitialize();
+ }
+
+ VReport(1, "AddressSanitizer Init done\n");
+
+ if (flags()->sleep_after_init) {
+ Report("Sleeping for %d second(s)\n", flags()->sleep_after_init);
+ SleepForSeconds(flags()->sleep_after_init);
+ }
+}
+
+// Initialize as requested from some part of ASan runtime library (interceptors,
+// allocator, etc).
+void AsanInitFromRtl() {
+ AsanInitInternal();
+}
+
+#if ASAN_DYNAMIC
+// Initialize runtime in case it's LD_PRELOAD-ed into unsanitized executable
+// (and thus normal initializers from .preinit_array or modules haven't run).
+
+class AsanInitializer {
+ public:
+ AsanInitializer() {
+ AsanInitFromRtl();
+ }
+};
+
+static AsanInitializer asan_initializer;
+#endif // ASAN_DYNAMIC
+
+} // namespace __asan
+
+// ---------------------- Interface ---------------- {{{1
+using namespace __asan;
+
+void NOINLINE __asan_handle_no_return() {
+ if (asan_init_is_running)
+ return;
+
+ int local_stack;
+ AsanThread *curr_thread = GetCurrentThread();
+ uptr PageSize = GetPageSizeCached();
+ uptr top, bottom;
+ if (curr_thread) {
+ top = curr_thread->stack_top();
+ bottom = ((uptr)&local_stack - PageSize) & ~(PageSize - 1);
+ } else if (SANITIZER_RTEMS) {
+ // Give up On RTEMS.
+ return;
+ } else {
+ CHECK(!SANITIZER_FUCHSIA);
+ // If we haven't seen this thread, try asking the OS for stack bounds.
+ uptr tls_addr, tls_size, stack_size;
+ GetThreadStackAndTls(/*main=*/false, &bottom, &stack_size, &tls_addr,
+ &tls_size);
+ top = bottom + stack_size;
+ }
+ static const uptr kMaxExpectedCleanupSize = 64 << 20; // 64M
+ if (top - bottom > kMaxExpectedCleanupSize) {
+ static bool reported_warning = false;
+ if (reported_warning)
+ return;
+ reported_warning = true;
+ Report("WARNING: ASan is ignoring requested __asan_handle_no_return: "
+ "stack top: %p; bottom %p; size: %p (%zd)\n"
+ "False positive error reports may follow\n"
+ "For details see "
+ "https://github.com/google/sanitizers/issues/189\n",
+ top, bottom, top - bottom, top - bottom);
+ return;
+ }
+ PoisonShadow(bottom, top - bottom, 0);
+ if (curr_thread && curr_thread->has_fake_stack())
+ curr_thread->fake_stack()->HandleNoReturn();
+}
+
+extern "C" void *__asan_extra_spill_area() {
+ AsanThread *t = GetCurrentThread();
+ CHECK(t);
+ return t->extra_spill_area();
+}
+
+void __asan_handle_vfork(void *sp) {
+ AsanThread *t = GetCurrentThread();
+ CHECK(t);
+ uptr bottom = t->stack_bottom();
+ PoisonShadow(bottom, (uptr)sp - bottom, 0);
+}
+
+void NOINLINE __asan_set_death_callback(void (*callback)(void)) {
+ SetUserDieCallback(callback);
+}
+
+// Initialize as requested from instrumented application code.
+// We use this call as a trigger to wake up ASan from deactivated state.
+void __asan_init() {
+ AsanActivate();
+ AsanInitInternal();
+}
+
+void __asan_version_mismatch_check() {
+ // Do nothing.
+}